Sorry tonysue I misread your post (at work so dipping im and out). I thought you had done them yourself!
So - you paid 35ytl for each one servicing and the muck that they should have taken out casued them to leak. I can see that.
As I said - doing your own is not hard and looks like it might be the safest bet until you think it's time for a full service.
Sorry for the misunderstanding